AIC1595

2A STEP-DOWN PWM REGULATOR

SPEC NO: DS-1595-P1 03/23/00

ANALOG INTEGRATIONS CORPORATION

www.analog.com.tw

4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.

TEL: (8863)577-2500 FAX:(8863)577-2510

4

PIN 1: IN

Supply

voltage

input

for

the

IC

switching regulator. A suitable input

bypass capacitor must be present at

this pin to minimize voltage transients

and to supply the switching currents

needed by the regulator.

PIN 2:OUT

Internal switch. The voltage at this pin

proximately –0.5V, with a duty cycle of

PIN 3: GND

Ground requires a short, low noise

connection

to

ensure

good

load

regulation.

PIN 4: FB

Feedback input for fixed-output or

adjustable-output version. Connect di-

rectly to output for fixed operation

version or to a resistor divider for ad-

justable operation versions.

PIN 5: SHDN Allows the switching regulator circuit

to be shutdown using logic level sig-

nals thus dropping the total input sup-

ply current to approximately 80

µA.

Drive it high to disable the reference ,

control circuitry and internal switches.

Drive low or connect to GND for nor-

mal operation.

IN

FB

OUT

COMP.

COMP.

GND

2.5V Regulator

1.25 V

Reference

Driver

Compensation

Circuit

SHDN

ON / OFF

AMP.

150/300

KHz OSC

Current

Limit

Latch

Thermal

Shutdown